Omron NT21 Series, Reference Manual

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5-1 Section Examples of Actual Applications of Direct Access
395
Displaying a screen with details of the times at which alarms occurred in the past
when the TEMPERATURE ABNORMAL alarm message is pressed.
Alarm list Alarm history
TEMPERATURE
ABNORMAL
TEMPERATURE ABNORMAL 13:12
CONVEYOR STOPPED 11:47
PROCESS 3 STOPPED 11:23
PT
1, 2, 3... 1. Set TEMPERATURE ABNORMAL as the initial value for any character
string memory table.
2. Make the following settings for any bit memory table.
•
PC Address:
PC bit number to be monitored
•
Function:
Alarm
•
History:
Check mark set
•
Switch screen:
Check mark set
•
Screen No.:
Number of the screen that displays the alarm history (refer to (4))
•
String table entry:
Number of the character string memory table for which settings were
made in (1).
3. Register an alarm list, set as indicated below, for any screen.
•
Color setting, Background, ON:
Red
•
List Settings:
Set the Start Bit Table Entry and No. of Bits Referenced so as to include the
bit memory table set in (2) above.
4. Register the set alarm history as follows on the screen that displays the
alarm history.
•
History Info: Check mark set
•
Order type: Order of occurrence
Suggestions
•
When designating the screen number with a bit memory table, the alarm histo-
ry can also be displayed by designating the following screen numbers.
•
No. 9001: Occurrence History Screen (page 235)
•
No. 9002: Frequency History Screen (page 235)
In this case, there is no need to register an alarm list.
Example:
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